package com.ellison.springdemo.config.thread;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * 线程池配置
 *
 * @author Ellison Pei
 * @version 1.0
 * @date 2021-08-26 14:23
 */
@Configuration
@EnableAsync
public class ExecutorConfig {

    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    @Bean
    public Executor asyncServiceExecutor() {
        logger.info("start asyncServiceExecutor");
        //ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

        //使用继承类，查看线程状态
        ThreadPoolTaskExecutor executor = new VisibleThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(5);
        //配置最大线程数
        executor.setMaxPoolSize(5);
        //配置队列大小
        executor.setQueueCapacity(99999);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix("async-service-thread-");

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();

        return executor;

    }

    @Bean
    public ThreadPoolExecutor threadPoolExecutor() {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 5, 1000L, TimeUnit.MILLISECONDS,
                new ArrayBlockingQueue<>(256), CustomThreadFactory.create("custom-thraad-pool-"));
        return executor;
    }
}

